[ale] Write permission

[Jim Kinney]

I like the sudo (used it many times) but the binaries are changing
daily. Yes, can grant sudo as user foo to contents of folder bar and
that may be part of the solution.
On Mon, 2016-05-16 at 17:02 -0400, DJ-Pfulio wrote:
> sudo isn't just to get access to the root account. It works great to
> access other accounts, if configured for that.
> 
> I've done some fairly complex things with sudo to provide access to
> other accounts (non-root) for thousands of end users who needed to
> run a
> few different programs as different userids. We controlled which
> options
> were allow too - sudo has config options for that as well. By far,
> this
> would be the easiest answer.
> 
> On 05/16/16 16:43, DJ-Pfulio wrote:
> > 
> > Force the processes to run under a different userid that is locked
> > down.
> > Users would use sudo to access that other account and launch the
> > program(s) with approved options only. Nothing else.  That user
> > account
> > could have access to create an LV for all temporary data, if you
> > wanted
> > to go crazy.  Just don't let their normal userids have access to
> > the
> > temporary areas.
> > 
> > Are the programs developed in-house?  Hard to stop the devs from
> > making
> > debug stuff write wherever they want.
> > 
> > On 05/16/16 10:48, Jim Kinney wrote:
> > > 
> > > I'm trying to envision a process that will have some funky
> > > permissions
> > > in play and would appreciate ideas.
> > > 
> > > Data is sensitive and stored in encrypted partition. Only users
> > > in the
> > > approved group can read in that folder.
> > > 
> > > They need to run that data through custom code that may do
> > > temporary
> > > writes somewhere. That will need to be locked down and either
> > > encrypted
> > > or overwritten after use (or both). This is the easy part.
> > > 
> > > I need to prevent that data from being written/copied anywhere
> > > else even
> > > if they have write permission (home dir).
> > > 
> > > I run CentOS 7 systems so I have selinux. However, once this
> > > scales off
> > > the individual research system to the cluster, I've disabled
> > > selinux on
> > > the cluster for performance reasons. I can activate it if the
> > > encrypted
> > > folders are mounted and limit runs to specific nodes if always
> > > running.
> > > 
> > > So I'm seeing (sort of. Not fully thought out yet) a rule that
> > > allows
> > > data read with binaries of a particular type that can only write
> > > to
> > > particular folders. Note that the final output of the data run is
> > > not
> > > sensitive but intermediate data may be. To run a process requires
> > > writing binary to specific folder. That folder forces all
> > > contents to be
> > > special type that is subject to selinux rule.
> > > 
> > > Can't allow users to directly read the files in order to disallow
> > > 'cat
> > > file > newfile' to disallowed folder.
> > > 
> > > Data files are (currently) video and output is ascii text so it's
> > > possible to check file types on output before allowed to copy to
> > > new folder.
> > > 
> > > However, the input data files may be ascii for a different groups
> > > work.
> > > 
> > > 
> > > 
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> > > 
> > 
> 
-- 
James P. Kinney III

Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

http://heretothereideas.blogspot.com/

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